2017/02/28 by Vahid Ansari, Georg Harder, Markus Allgaier +2 · 54 citations
Computer Science · Physics and Astronomy · #Acoustics #Artificial intelligence #Coherent states #Computer science #Detector #Encoding (memory) #Fidelity #High fidelity #Measurement device #Mechanical and Optical Resonators #Mode (computer interface) #Optics #Photon #Physics #Pulse (music) #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Quantum state #Quantum tomography #Set (abstract data type) #Telecommunications #Tomography #quant-ph
paper · pdf · doi:10.1103/physreva.96.063817
published in Physical Review A 96(6) (American Physical Society)
openalex publication_date 2017/12/13 · arxiv created 2017/12/14 · arxiv updated 2017/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Encoding quantum information in the photon temporal mode (TM) offers a robust platform for high-dimensional quantum protocols. The main practical challenge, however, is to design a device that operates on single photons in specific TMs and all coherent superpositions. The quantum pulse gate (QPG) is a mode-selective sum-frequency generation designed for this task. Here, we perform a full modal characterization of a QPG using weak coherent states in well-defined TMs. We reconstruct a full set of measurement operators, which show an average fidelity of 0.85 to a theoretically ideal device when operating on a seven-dimensional space. Then we use these characterized measurement operators of the QPG to calibrate the device. Using the calibrated device and a tomographically complete set of measurements, we show that the QPG can perform high-dimensional TM state tomography with 0.99 fidelity.